package STRING;

public class StringBuilderDemo {
    public static void main(String[] args) {
//        StringBuilder builder1 =new StringBuilder();
//        StringBuilder builder2= new StringBuilder("abc");
//
//        String str="abc";
//        StringBuilder builder3=new StringBuilder(str);
//        String str2=builder3.toString();

        String str="好好学些java";
        StringBuilder builder=new StringBuilder(str);

        builder.append(",为了找一个好工作");
        System.out.println(builder);

        builder.replace(9,90,"就是为了能出任CEo，迎娶白富美，走上人生巅峰");
        System.out.println(builder);

        builder.delete(0,8);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);
    }
}
